A modular manufacturing method for steel box girders

Abstract

The present invention provides a modular manufacturing method for steel box girders. By dividing the modules of the steel box girder segments, after the required plate units are prepared, multiple modules can be assembled simultaneously on the jig, and finally the assembled modules are hoisted to the general assembly jig for assembly, effectively shortening the time for assembling the plate units into the steel box girder segments and improving the manufacturing efficiency of the steel box girders; at the same time, when assembling each module, the volume of each module is relatively small compared to the entire steel box girder segment, which can facilitate the preliminary control of the deformation generated during the assembly welding process, reduce the adverse impact of the cumulative welding deformation on the assembly quality of the steel box girder segment, and effectively improve the manufacturing quality of the steel box girders.

Description

Technical Field

[0001] The present invention relates to the technical field of steel box girder assembly, and more particularly to a modular manufacturing method for steel box girders. Background Art

[0002] In the construction of long-span bridges, steel box girders are mostly used as the main structure. A steel box girder, also known as a steel plate box girder, generally has a relatively large span and is welded by a top plate, a bottom plate, webs, diaphragms, and longitudinal diaphragms.

[0003] Currently, the main structure of a steel box girder is generally assembled using plate elements on a jig. The operation points are relatively concentrated, resulting in a relatively long total assembly time. Moreover, the deformation during assembly welding is relatively large, which is likely to have an adverse impact on the accuracy of the size and alignment of the steel box girder. Summary of the Invention

[0004] The problem solved by the present invention is how to improve the manufacturing efficiency while ensuring the manufacturing quality of the steel box girder.

[0005] To solve the above problems, the present invention provides a modular manufacturing method for steel box girders, including:

[0006] Dividing the steel box girder segments into modules, where the modules include side box chambers and middle box chambers;

[0007] Preparing the plate elements of the modules;

[0008] Assembling the plate elements into the modules;

[0009] Transporting the modules to the general assembly jig and assembling them into the steel box girder segments;

[0010] Performing box mouth matching between the steel box girder segments to complete the matching general assembly.

[0011] Compared with the prior art, the beneficial effects of the present invention include: By dividing the steel box girder segments into modules, after the required plate elements are prepared, multiple modules can be assembled simultaneously on the jig. Finally, the assembled modules are transported to the general assembly jig for assembly, effectively shortening the time from assembling the plate elements to obtaining the steel box girder segments and improving the manufacturing efficiency of the steel box girder. At the same time, when assembling each module, the volume of each module is relatively small compared to the entire steel box girder segment, which facilitates the preliminary control of the deformation generated during assembly welding and reduces the adverse impact of the cumulative welding deformation on the assembly quality of the steel box girder segment, effectively improving the manufacturing quality of the steel box girder.

[0012] Optionally, the module further includes a wind nozzle, and the modular manufacturing method for the steel box girder further includes:

[0013] Dividing the wind nozzle into multiple assembly blocks;

[0014] The plate unit for fabricating the air nozzle;

[0015] Assemble the plate unit into the assembled block;

[0016] Assemble the assembled blocks into the air nozzle;

[0017] Install a fixed support frame and a lifting lug for turning over on the air nozzle, and conduct turning-over lifting;

[0018] Transport the air nozzle to the overall assembly jig, and assemble it with the side box chamber.

[0019] Optionally, the assembling the assembled blocks into the air nozzle specifically includes:

[0020] Match a part of the assembled blocks of the air nozzle to complete one round of assembly;

[0021] Match the last assembled block of the one-round assembly with another part of the assembled blocks of the air nozzle, and adjust the error of the one-round assembly to complete the two-round assembly;

[0022] Continue to perform the same steps as the two-round assembly until the assembly of the air nozzle is completed.

[0023] Optionally, the assembling the plate unit into the module specifically includes:

[0024] Use the plate unit to assemble the side box chamber, wherein during the assembly, adjust the box opening size, welding deformation and angular deformation of the weld of the side box chamber.

[0025] Optionally, the using the plate unit to assemble the side box chamber further includes:

[0026] Use the plate unit to assemble the anchor box;

[0027] Assemble the anchor box with the side box chamber.

[0028] Optionally, the assembling the plate unit into the module specifically includes:

[0029] Use the plate unit to assemble the middle box chamber, wherein during the assembly, first straighten the flatness of the partition plate members of the middle box chamber, then cut them, and finally set the pre-camber.

[0030] Optionally, vertical and horizontal lines are arranged on the overall assembly jig, and a cable anchoring structure is provided on the side box chamber. The transporting the module to the overall assembly jig and assembling it into the steel box girder segment specifically includes:

[0031] Transport the side box chamber to the overall assembly jig and position it through the vertical and horizontal lines and the cable anchoring structure;

[0032] With the side box chamber as a reference, assemble the middle box chamber.

[0033] Optionally, transporting the side box chamber to the overall assembly jig, and positioning it through the vertical and horizontal linear types and the cable anchoring structure, specifically including:

[0034] Use a beam transport trolley to transport the side box chamber to the overall assembly jig, and roughly position the side box chamber through the vertical and horizontal linear types.

[0035] A driving device is provided on the overall assembly jig to drive the side box chamber to move and finely position the side box chamber.

[0036] Use the cable anchoring structure to connect the side box chamber to the overall assembly jig to complete the positioning.

[0037] Optionally, a bridge deck is further provided on the steel box girder, the bridge deck is a composite steel plate, and the modular manufacturing method of the steel box girder further includes:

[0038] Perform welding between the base layer, transition layer and cladding layer of the bridge deck, wherein the welding is multi-point simultaneous preheating welding.

[0039] Optionally, a steel-concrete joint is further provided on the steel box girder, the steel-concrete joint is a gridless top and bottom plate bearing plate type steel-concrete joint, and the modular manufacturing method of the steel box girder further includes: using gas shielded welding to weld the bearing plate and the top and bottom plates, and welding sequentially from the part with large weld stress to the part with small weld stress. Brief Description of the Drawings

[0040] Figure 1 It is a flowchart of the modular manufacturing method of the steel box girder in an embodiment of the present invention;

[0041] Figure 2 is Figure 1 a sub-flowchart of the modular manufacturing method of the steel box girder in

[0042] Figure 3 is Figure 2 a sub-flowchart of the modular manufacturing method of the steel box girder in

[0043] Figure 4 It is a flowchart of the modular manufacturing method of the steel box girder in another embodiment of the present invention;

[0044] Figure 5 is Figure 4 a sub-flowchart of the modular manufacturing method of the steel box girder in Detailed Description of the Embodiment

[0045] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe in detail the specific embodiments of the present invention with reference to the accompanying drawings.

[0046] To solve the above problems, an embodiment of the present invention provides a method for modular manufacturing of steel box girders, including:

[0047] Dividing the steel box girder segments into modules, where the modules include side box chambers and middle box chambers;

[0048] Preparing the plate units of the modules;

[0049] Assembling the plate units into modules;

[0050] Lifting and transporting the modules to the overall assembly jig and assembling them into steel box girder segments;

[0051] Performing box mouth matching between the steel box girder segments to complete the overall matching assembly.

[0052] It should be noted that in this embodiment, the assembly between the plate units, the assembly between the modules, and the assembly between the steel box girder segments are all welding.

[0053] During the construction process of steel box girder manufacturing, for a steel box girder, it can be divided into several steel box girder segments, as Figure 1 shown in S1 to S5. In this embodiment, first, a steel box girder segment is modularly divided. Specifically, it can be divided into two side box chambers and one middle box chamber; subsequently, the plate units of the modules are prepared. Specifically, according to the divided side box chambers and middle box chambers, the plate units that can be assembled into the side box chambers and middle box chambers are respectively prepared; then, the plate units are assembled into modules. Specifically, the plate units are used to simultaneously assemble the side box chambers and middle box chambers on the jig; then, the assembled modules are lifted and transported to the overall assembly jig and assembled into steel box girder segments. Specifically, the assembled side box chambers and middle box chambers are lifted and transported to the overall assembly jig for assembly to form a steel box girder segment; then, equipment pipelines are connected and welding inside the steel box girder segment is performed; finally, box mouth matching is performed between the steel box girder segments. After the box mouth matching is completed, the steel box girder segments after the overall matching assembly can be lifted and transported to the construction site for construction operations.

[0054] In this way, through the modular division of the steel box girder segments, after the required plate units are prepared, multiple modules can be simultaneously assembled on the jig, and finally the assembled modules are lifted and transported to the overall assembly jig for assembly, effectively shortening the time from assembling the plate units to obtaining the steel box girder segments and improving the manufacturing efficiency of the steel box girder; at the same time, when assembling each module, the volume of each module is relatively small compared to the entire steel box girder segment, which can facilitate the preliminary control of the deformation generated during the assembly welding process and reduce the adverse impact of the cumulative welding deformation on the assembly quality of the steel box girder segment, effectively improving the manufacturing quality of the steel box girder.

[0055] It should be noted that in this embodiment, interval matching is carried out between the steel box girder segments, and a certain distance is opened between the box openings of the segments, which is convenient for equipment pipelines to enter the steel box girder segments for construction, can ventilate and effectively improve the construction environment, and is also convenient for cutting the surplus in the length direction of the plate units. When carrying out the box opening matching of the steel box girder segments after the matching is completed, a three-way jack can be used to drive the movement of the steel box girder segments to complete the zero-distance matching between the steel box girder segments, and matching parts are installed for connection to restore the separated beam segments to the actual bridge position and reach the fully matched state.

[0056] It should be noted that when assembling and connecting the steel box girder segments, it is carried out on the general assembly jig. First, a round of assembly of multiple steel box girder segments is carried out, and then, taking the last assembled steel box girder segment as the mother beam, the next round of assembly is carried out. During the assembly of the next round, taking the mother beam as the reference, the corresponding steel box girder segments are adjusted to offset the errors generated in the previous round of assembly and ensure the accuracy of the assembly.

[0057] Different from the above embodiment, the module further includes a wind nozzle, and the modular manufacturing method of the steel box girder further includes:

[0058] Dividing the wind nozzle into multiple assembly blocks;

[0059] Preparing the plate units of the wind nozzle;

[0060] Assembling the plate units into assembly blocks;

[0061] Assembling the assembly blocks into a wind nozzle;

[0062] Setting a fixed support frame and a turning and hoisting lug on the wind nozzle for turning and hoisting;

[0063] Transporting the wind nozzle to the general assembly jig and assembling it with the side box chamber.

[0064] In order to further improve the assembly quality and efficiency of the steel box girder segments, as shown in T1 to T6 in Figure 4 In this embodiment, a steel box girder segment is divided into two wind nozzles, two side box chambers and one middle box chamber.

[0065] Specifically, the air nozzle is divided into multiple assembled blocks. The plate units of the air nozzle are prepared according to the divided assembled blocks. The plate units are assembled into assembled blocks, and the assembled blocks are assembled into the air nozzle. In this way, when splicing the air nozzle, according to the divided assembled blocks, multiple assembled blocks can be assembled simultaneously, and then the assembled assembled blocks are assembled into the air nozzle, effectively reducing the time required to assemble the air nozzle from the plate units and improving the manufacturing efficiency of the entire steel box girder. Next, the air nozzle is generally reversely assembled on a flat jig. After assembly, a fixed support frame is used to support the assembled air nozzle, and a turning and hoisting lug is connected. Through the connection between the hoisting device and the turning and hoisting lug, the turning and hoisting of the air nozzle are completed. The fixed support frame can effectively prevent the air nozzle from deforming during the turning process. Finally, the air nozzle is transported to the overall assembly jig and assembled with the side box chamber.

[0066] Optionally, assembling the assembled blocks into the air nozzle specifically includes:

[0067] Match a part of the assembled blocks of the air nozzle to complete one round of assembly;

[0068] Match the last assembled block of one round of assembly with another part of the assembled blocks of the air nozzle, adjust the error of one round of assembly, and complete the second round of assembly;

[0069] Continue to perform the same steps as the second round of assembly until the assembly of the air nozzle is completed.

[0070] To further improve the assembly quality of the air nozzle, as shown in T4 in Figure 4 and T41 to T43 in Figure 5 In this embodiment, the assembled blocks of the air nozzle are divided into multiple groups for multiple rounds of assembly. During the first round of assembly, first assemble a group of assembled blocks. After completion of the assembly, perform the second round of assembly. Among them, the last assembled block in the first round of assembly participates in the second round of assembly. The assembled blocks in the second round of assembly are assembled based on the last assembled block in the first round of assembly, and adjustments are made during the assembly process to offset the error generated in the first round of assembly, effectively improving the assembly accuracy and the assembly quality of the air nozzle. Of course, repeat the same steps as the second round of assembly for the remaining rounds of assembly until the assembly of the air nozzle is completed, effectively reducing the deformation error and assembly error generated during the assembly and welding process.

[0071] Optionally, assembling the plate units into modules specifically includes:

[0072] Use the plate units to assemble the side box chamber, and during the assembly, adjust the box opening size, welding deformation, and angular deformation of the weld of the side box chamber.

[0073] In order to further improve the assembly and welding accuracy of the side box chamber and reduce the assembly error, in this embodiment, during the assembly of the side box chamber using plate units, the box opening size of the side box chamber, the deformation generated during assembly and welding, and the angular deformation generated by the weld are also controlled.

[0074] Exemplarily, when using plate units for the assembly and welding of the side box chamber, the distance between the end partition plate of the side box chamber and the end is relatively long, and the partition plate, as the inner tire of the side box chamber, has a weak constraint on the box opening size of the end, which is likely to cause the box opening size to exceed the tolerance, resulting in a box opening offset during overall assembly. A reusable box-shaped member box opening size control device can be used to adjust the box opening size of the side box chamber. Specifically, the reusable box-shaped member box opening size control device includes a partition plate, a plurality of seat plates, a plurality of bolts, and an angle steel seat. Among them, the partition plate is a square plate member, and a plurality of seat plates are installed on its end face. Threaded holes are provided on the body of the seat plate, and bolts are installed in the threaded holes; the distances between the plurality of seat plates and the two adjacent sides of the partition plate are equal, and angle steel seats are installed at the diagonals corresponding to the included angle of the two adjacent sides. The angle steel seat has a right-angle folded edge structure, and its two right-angle sides are attached to the other two adjacent sides of the partition plate. During the assembly and welding of the member group, after the bolts are tightened and attached to the angle steel seat, the partition plate and the box-shaped member form an integral body, improving the overall stiffness of the welding operation, playing a role in resisting welding shrinkage deformation and controlling the box opening size. At the same time, it is convenient to disassemble and reuse the partition plate, effectively improving the construction efficiency of box-shaped member welding and reducing material loss.

[0075] Exemplarily, when using plate units for the assembly and welding of the side box chamber, an anti-deformation jig can also be used to control the welding deformation of the side box chamber, effectively reducing the influence of welding deformation on the assembly quality of the side box chamber.

[0076] Exemplarily, when using plate units for the assembly and welding of the side box chamber, the top plate of the side box is a stainless steel plate, and the distance that the edge of the top plate extends out of the web is relatively short, which is likely to cause large and difficult-to-control post-welding deformation, and post-welding flame adjustment cannot be carried out. A box-shaped member main weld angular deformation calibration device can also be used to adjust the angular deformation of the welding seam of the side box chamber, and control the flatness of the top plate of the side box chamber within a reasonable range. Specifically, the box-shaped member main weld angular deformation calibration device includes an upper crossbeam. A lifting ring is provided at the upper end of the upper crossbeam. Hook-shaped clamping plates are provided at both the left and right ends of the upper crossbeam. A hydraulic jack is provided at the lower end of the upper crossbeam. Guide devices fixedly connected to the upper crossbeam are provided on both sides of the hydraulic jack. Leveling blocks are provided on the inner sides of the hook-shaped clamping plates. Travel devices are provided at both ends of the leveling blocks. Align this device with the member to be calibrated, hook the hook-shaped clamping plates to the lower side of the member, start the hydraulic jack, make the hydraulic jack move vertically downward until it contacts the upper surface of the member, and at the same time the leveling blocks act upward and contact the angular deformation area. The hydraulic jack is slowly pressurized to gradually restore the deformed part. While the hydraulic jack is working, the operator can measure the deformation on the top surface. When it is restored to the specification requirements, stop the operation of the hydraulic jack.

[0077] Optionally, when assembling the side box chamber using plate units, it further includes:

[0078] Assembling the anchor box using plate units;

[0079] Assembling the anchor box and the side box chamber.

[0080] In this embodiment, the side box chamber is a rod with double anchor boxes, and the weight of a single rod is relatively large. Therefore, during the assembly of the side box chamber, the anchor box is prefabricated separately. First, the corresponding plate units are prepared. After assembling the plate units into the anchor box, the anchor box and the side box chamber are assembled, effectively reducing the total time for assembling the side box chamber.

[0081] It should be noted that in this embodiment, the bearing plate of the anchor box needs to be welded tightly against the anchor backing plate after grinding. The tight grinding is achieved by separately machining the end face of the cross-shaped structure of the bearing plate and the top face of the anchor backing plate, effectively improving the assembly welding quality of the anchor box.

[0082] Optionally, assembling the plate units into a module, specifically including:

[0083] Assembling the middle box chamber using plate units. During the assembly, first correct the flatness of the partition plate members of the middle box chamber, then perform cutting, and finally set the pre-camber.

[0084] In this embodiment, in order to further improve the assembly welding accuracy of the middle box chamber and reduce the assembly error, during the assembly of the middle box chamber using plate units in this embodiment, the flatness of the partition plate members of the middle box chamber is also corrected and the pre-camber is set, which is convenient for the middle box chamber to be assembled with the side box chamber on the overall assembly jig.

[0085] Specifically, the middle box chamber partition is a solid web partition, which needs to be manufactured in sections and then combined into a whole. The partition belongs to an extra-wide part. In order to ensure the accurate relative position of the height of the partition and the upper and lower notches, during splicing, first correct the flatness of the partition to make it reach the corresponding position of the notch, and then perform numerical control cutting to ensure the assembly accuracy of the middle box chamber. At the same time, during the assembly of the middle box chamber, the welding of the top and bottom plate welds will cause the lateral shrinkage of the partition, and the self-weight of the partition will also cause a certain amount of deflection. Therefore, a certain pre-camber needs to be set during the manufacture of the partition unit to offset the deformation caused by welding and self-weight. In addition, the setting of the pre-camber also needs to consider the pre-camber of the overall assembly jig to make the middle box chamber match the overall assembly jig.

[0086] It should be noted that when assembling the middle box chamber, weights can also be set at the two free ends of the middle box chamber to increase the stress at both ends of the middle box chamber partition and prevent the two ends of the partition from warping during assembly welding, improving the assembly quality.

[0087] Optionally, longitudinal and transverse linear guides are set up on the overall assembly jig, and cable anchoring structures are provided on the side box chambers. The modules are hoisted to the overall assembly jig and assembled into steel box girder segments, specifically including:

[0088] Hoist the side box chambers to the overall assembly jig and position them through the longitudinal and transverse linear guides and the cable anchoring structures;

[0089] Taking the side box chambers as the benchmark, assemble the middle box chambers.

[0090] In order to ensure the accuracy during the assembly on the overall assembly jig, in this embodiment, as shown in S4 in Figure 1 and S41 and S42 in Figure 2 , longitudinal and transverse linear guides are set up on the overall assembly jig. When hoisting each module, hoist each module along the longitudinal and transverse linear guides to the overall assembly jig for positioning, improving the matching efficiency during the subsequent overall assembly. At the same time, during the assembly, taking the side box chambers as the assembly benchmark, cable anchoring structures are provided on the side box chambers. When the side box chambers are placed on the overall assembly jig, use the cable anchoring structures to fix the side box chambers on the overall assembly jig, facilitating the subsequent assembly of the middle box chambers and the wind nozzles.

[0091] Optionally, hoist the side box chambers to the overall assembly jig and position them through the longitudinal and transverse linear guides and the cable anchoring structures, specifically including:

[0092] Use a beam transport trolley to hoist the side box chambers to the overall assembly jig and roughly position the side box chambers through the longitudinal and transverse linear guides,

[0093] Drive devices are provided on the overall assembly jig to drive the side box chambers to move and finely position the side box chambers;

[0094] Use the cable anchoring structures to connect the side box chambers with the overall assembly jig to complete the positioning.

[0095] In order to improve the positioning accuracy of the side box chambers, as shown in S41 and Figure 2 S411, S412 and S413 in Figure 3 , in this embodiment, when hoisting the side box chambers to the overall assembly jig by a beam transport trolley, first roughly position and place the side box chambers through the longitudinal and transverse linear guides. At the same time, use the drive devices on the overall assembly jig to drive the side box chambers to move and finely position the side box chambers to ensure the accurate positioning of the side box chambers. Finally, use the cable anchoring structures to connect the side box chambers with the overall assembly jig to complete the positioning of the side box chambers.

[0096] It should be noted that in this embodiment, the drive device is a three-way jack. The three-way jack is arranged below the overall assembly jig and drives the side box chambers to move by jacking.

[0097] Optionally, a bridge deck is further provided on the steel box girder. The bridge deck is a composite steel plate. The modular manufacturing method of the steel box girder further includes:

[0098] Weld the base layer, transition layer and cladding layer of the bridge deck. Among them, the welding is multi-point simultaneous preheating welding.

[0099] In this embodiment, during the manufacturing process of the steel box girder, a bridge deck is also provided on the steel box girder. The bridge deck is a stainless steel composite steel plate, which is composed of stainless steel and low-carbon steel. The three-layer welding technology of the base layer, transition layer and cladding layer is used for welding. And during the welding process, multi-point simultaneous preheating welding is used to effectively maintain the temperature of the welding area, reduce gas consumption, and improve the construction quality of stainless steel welding.

[0100] Specifically, in this embodiment, the multi-point simultaneous preheating welding is realized by a pre-welding preheating device that can heat multiple points simultaneously. The pre-welding preheating device that can heat multiple points simultaneously includes a main pipe, a preheater, a hose, a mounting bracket, a spring, a branch pipe, and a handle. Among them, the main pipe body is provided with a preheater with an arc-shaped outlet end. The preheater is connected to the main pipe through a hose and is installed on the mounting bracket in a hinged form. The mounting bracket is fixed on the main pipe; one end of the preheater is connected to a spring, and the other end of the spring is connected to the mounting bracket; the unclosed end of the main pipe is connected to the branch pipe, and the branch pipe is connected to a combustible gas source; at the same time, a handle is also provided on the side wall of the main pipe. The present invention uses the wall attachment effect of the arc-shaped surface of the preheater port to guide the combustible gas to spray toward both sides, so that the deflagration wave formed by ignition on one side serves as the excitation source of the elastic system, causing the preheater to swing reciprocally while spraying flames, thereby forming uniform heating in a linear area, and implementing high-efficiency, high-precision, and high-uniformity pre-welding preheating for large workpieces.

[0101] Optionally, a steel-concrete joint is also provided on the steel box girder. The steel-concrete joint is a gridless top and bottom plate bearing plate type steel-concrete joint. The modular manufacturing method of the steel box girder further includes: using gas shielded welding to weld the bearing plate and the top and bottom plates, and welding sequentially from the part with greater weld stress to the part with smaller weld stress.

[0102] In this embodiment, in order to facilitate the connection between the steel box girder and the concrete box girder, a steel-concrete joint is also provided on the steel box girder. The steel-concrete joint adopts a gridless top and bottom plate bearing plate type steel-concrete joint. First, weld the welds of the bearing plate and the top and bottom plates, and weld sequentially from the part with greater weld stress to the part with smaller weld stress. Use gas shielded welding for welding, control the welding line energy to reduce the heat input of welding, reduce welding deformation, and improve the manufacturing quality of the steel box girder.

[0103] It should be noted that in the embodiments of the present invention, the welding between plate units, between modules, and between steel box girder segments is all automated welding.

[0104] It should be noted that in the embodiments of the present invention, the total assembly of the steel box girder can directly obtain the relative coordinates of the main marked points on-site in segments through a total station. Through coordinate transformation, the matching of the local coordinates on-site of the object and the design coordinates of the steel structure can be achieved, and the deviation between the on-site data and the theoretical data can be obtained, thereby guiding the on-site operation and realizing the digitization of the measurement and analysis operations, greatly reducing the workload on the construction site and improving the measurement efficiency and the accuracy and reliability of the measurement data.

[0105] Exemplarily, first, for each total assembly round, three measurement towers standing opposite each other are erected. A coordinate system is established with the center of the top plate of the mother beam end as the reference, and the coordinates of the control points on the top surface of the mother beam segment are controlled through the measurement towers to achieve the control of the spatial relative position between the mother beam and the newly fabricated beam. Secondly, 14 temporary measurement points are arranged on the cross-section box opening, mainly used to measure the coordinates of the cross-section dimensions to provide a basis for adjusting the box opening. Thirdly, the three-dimensional imaging lidar technology, that is, the real scene replication technology, is used to collect the three-dimensional data of the steel beam in all directions, in a large area, and with high density. Through the real-time monitoring and deviation correction of the linearity and elevation of the box girder during the construction process, it provides a guarantee for the smooth progress of the on-site installation. Finally, the measurement data is computer-fitted. The measurement data of the box opening includes three sensitive factors causing misalignment, namely the cross slope of the top plate, the flatness of the bottom plate, and the perpendicularity of the web. 21 points are taken for slope measurement for each cross-section, and 6 points are taken for perpendicularity measurement for each web. A set of data is measured respectively at the end diaphragm, 1.4 m away from the diaphragm, and the very end of the box girder. The data is compared to simulate the deviation.

[0106] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will all fall within the protection scope of the present invention.

Claims

1. A modular manufacturing method for steel box girders, characterized in that, Including: Dividing the steel box girder segment into modules, where the modules include side box chambers and middle box chambers; Fabricating the plate units of the modules; Assembling the plate units into the modules; Lifting and transporting the modules to the general assembly jig, and assembling them into the steel box girder segment; Performing box opening matching between the steel box girder segments to complete the general assembly; The module further includes a wind fairing. Assembling the plate units of the wind fairing into assembling blocks; Assembling the assembling blocks into the wind fairing, including: matching a part of the assembling blocks of the wind fairing to complete the first round of assembly; Matching the last assembling block of the first round of assembly with another part of the assembling blocks of the wind fairing, adjusting the error of the first round of assembly to complete the second round of assembly; continuing to perform the same steps as the second round of assembly until the assembly of the wind fairing is completed.

2. The modular manufacturing method of the steel box girder according to claim 1, characterized in that, The modular manufacturing method of the steel box girder further includes: Setting a fixed support frame and a turning and hoisting lug on the wind fairing for turning and hoisting; Lifting and transporting the wind fairing to the general assembly jig and assembling it with the side box chamber.

3. The modular manufacturing method of the steel box girder according to claim 1, characterized in that, The assembling of the plate units into the module specifically includes: Using the plate units to assemble the side box chamber, where during assembly, adjusting the box opening size, welding deformation, and angular deformation of the weld of the side box chamber.

4. The modular manufacturing method of the steel box girder according to claim 3, wherein, The using of the plate units to assemble the side box chamber further includes: Using the plate units to assemble the anchor box; Assembling the anchor box with the side box chamber.

5. The modular manufacturing method of the steel box girder according to claim 1, characterized in that The assembling of the plate units into the module specifically includes: Using the plate units to assemble the middle box chamber, where during assembly, first correcting the flatness of the partition plate members of the middle box chamber, then cutting, and finally setting a pre-camber.

6. The method for modular manufacturing of steel box girders according to claim 1, characterized in that, Longitudinal and transverse lines are arranged on the general assembly jig, and a cable anchoring structure is provided on the side box chamber. The lifting and transporting of the module to the general assembly jig and assembling it into the steel box girder segment specifically includes: Lifting and transporting the side box chamber to the general assembly jig and positioning it through the longitudinal and transverse lines and the cable anchoring structure; Taking the side box chamber as a reference to assemble the middle box chamber.

7. The modular manufacturing method of the steel box girder according to claim 6, characterized in that The lifting and transporting of the side box chamber to the general assembly jig and positioning it through the longitudinal and transverse lines and the cable anchoring structure specifically includes: Using a beam transporting trolley to lift and transport the side box chamber to the general assembly jig and performing rough positioning of the side box chamber through the longitudinal and transverse lines, A driving device is provided on the general assembly jig to drive the side box chamber to move for fine positioning of the side box chamber; Connecting the side box chamber with the general assembly jig using the cable anchoring structure to complete the positioning.

8. The modular manufacturing method of the steel box girder according to claim 1, characterized in that, A bridge deck is further provided on the steel box girder, and the bridge deck is a composite steel plate. The modular manufacturing method of the steel box girder further includes: Performing welding between the base layer, transition layer, and cladding layer of the bridge deck, where the welding is multi-point simultaneous preheating welding.

9. The modular manufacturing method of the steel box girder according to claim 1, characterized in that, A steel-concrete joint is further provided on the steel box girder, and the steel-concrete joint is a lattice-free top and bottom plate bearing plate type steel-concrete joint. The modular manufacturing method of the steel box girder further includes: using gas shielded welding to weld the bearing plate and the top and bottom plates, and welding sequentially from the part with greater weld stress to the part with smaller weld stress.

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